Year current US$ 2006 670000.016689301 2007 560000.002384186 2008 610000.014305115 2009 349999.99403953605 2010 589999.973773956 2011 280000.001192093 2012 689999.997615814 2013 389999.98569488496 2014 769999.980926514 2015 624603.450298309 2016 277623.802423477 2017 431281.715631485 2018 714799.94058609 2019 565324.306488037 2020 487554.550170898 2021 507061.12384796096 2022 391740.143299103